1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
#include "systemc.h"
#include "specialized_signals/scx_signal_int.h"
#include "specialized_signals/scx_signal_signed.h"
#include "specialized_signals/scx_signal_uint.h"
#include "specialized_signals/scx_signal_unsigned.h"
SC_MODULE(up_down)
{
sc_in_clk clk;
sc_in<sc_uint<1> > up;
sc_in<sc_uint<1> > down;
sc_in<sc_uint<9> > data_in;
sc_inout<sc_uint<1> > parity_out;
sc_inout<sc_uint<1> > carry_out;
sc_inout<sc_uint<1> > borrow_out;
sc_inout<sc_uint<9> > count_out;
sc_uint<10> cnt_dn;
sc_uint<10> cnt_up;
sc_uint<9> count_nxt;
sc_uint<1> load;
SC_CTOR(up_down)
{
SC_METHOD(run);
sensitive << clk.pos();
}
void run()
{
cnt_dn = count_out - 5;
cnt_up = count_out + 3;
load = 1;
switch( (unsigned int )(up,down) ) {
case(0):
count_nxt = data_in;
break;
case(1):
count_nxt = cnt_dn;
break;
case(2):
count_nxt = cnt_up;
break;
case(3):
load = 0;
break;
}
if( load) {
parity_out = count_nxt.xor_reduce();
carry_out = up&cnt_up[9];
borrow_out = down&cnt_dn[9];
count_out = count_nxt;
}
}
};
#define UP_DOWN(up, down) up, down
struct stimulus {
int up;
int down;
int data_in;
} s[] = {
{ UP_DOWN(0, 0), 200 }, /* load 200 */
{ UP_DOWN(1, 0), 0 }, /* inc */
{ UP_DOWN(1, 0), 0 }, /* inc */
{ UP_DOWN(0, 1), 0 }, /* dec */
{ UP_DOWN(0, 1), 0 }, /* dec */
{ UP_DOWN(0, 1), 0 }, /* dec */
{ UP_DOWN(1, 1), 0 }, /* hold */
{ UP_DOWN(1, 1), 0 }, /* hold */
{ UP_DOWN(1, 1), 0 }, /* hold */
{ UP_DOWN(0, 0), 200 }, /* load 200 */
{ UP_DOWN(1, 1), 0 }, /* hold */
{ UP_DOWN(1, 1), 0 }, /* hold */
{ UP_DOWN(0, 1), 0 }, /* dec */
{ UP_DOWN(0, 0), 2 }, /* load 2 */
{ UP_DOWN(0, 1), 0 }, /* dec */
{ UP_DOWN(0, 0), 0x1ff},/* load 0x1ff */
{ UP_DOWN(1, 0), 0 }, /* inc */
};
int sc_main(int argc, char* argv[])
{
sc_signal<sc_uint<1> > borrow_out;
sc_signal<sc_uint<1> > carry_out;
sc_clock clock;
sc_signal<sc_uint<9> > count_out;
sc_signal<sc_uint<9> > data_in;
sc_signal<sc_uint<1> > down;
unsigned int i;
sc_signal<sc_uint<1> > parity_out;
sc_signal<sc_uint<1> > up;
up_down up_down_0("up_down_0");
up_down_0.borrow_out(borrow_out);
up_down_0.carry_out(carry_out);
up_down_0.data_in(data_in);
up_down_0.clk(clock);
up_down_0.count_out(count_out);
up_down_0.down(down);
up_down_0.parity_out(parity_out);
up_down_0.up(up);
printf("%5s %2s %4s %7s %10s %8s %10s %9s\n",
"clock", "up", "down", "data_in", "parity_out",
"carry_out", "borrow_out", "count_out");
for( i = 0; i < sizeof s/sizeof(struct stimulus); i++) {
up = s[i].up;
down = s[i].down;
data_in = s[i].data_in;
sc_start(1, SC_NS);
printf("%5d %2d %4d %7d %10d %8d %10d %9d\n",
(int)sc_time_stamp().to_double()/1000, (int)up, (int)down,
(int)data_in, (int)parity_out, (int)carry_out, (int)borrow_out,
(int)count_out);
}
/* get last register values */
printf("%5d %2d %4d %7d %10d %8d %10d %9d\n",
(int)sc_time_stamp().to_double()/1000, (int)up, (int)down,
(int)data_in, (int)parity_out, (int)carry_out, (int)borrow_out,
(int)count_out);
return 0;
}
|
